Linear Actuator

a technology of actuators and actuators, applied in the direction of mechanical equipment, machines/engines, non-mechanical valves, etc., can solve the problem of high production cost of arrangemen

Inactive Publication Date: 2008-11-20
COMPACT DYNAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These arrangements require very high expenditure in production, since the mounting of the coils around the individual teeth is difficult to implement.

Method used

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  • Linear Actuator
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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0040]In FIG. 1, an electrical linear actuator 10, which has a rotor 16 and a stator 18 which are connected via a rod 12a to a part (not illustrated) to be driven, is illustrated.

[0041]The rotor 16 has two parallel stacks 14, 14′, which are arranged at a distance L from each other, of multiple permanently magnetic rods 30, 30′, which are of essentially cuboidal shape and arranged one above another.

[0042]The stator 18 is in the form of a soft magnetic mould of sintered ferrous metal powder or layered iron sheets. The stator 18 has multiple tooth pairs 22a, 22a′; 22b, 22b′; 22c, 22c′; 22d, 22d′; 22e, 22e′; 22f, 22f′ with teeth 22 opposite each other. Between the teeth 22 of each tooth pair, one of the two stacks 14, 14′ is received, forming an air gap 24 and 24′ respectively.

[0043]Between the two stacks 14, 14′ of the rotor 16, the stator 18 has magnetically conducting inner areas 50, 50a, which are arranged at a predetermined distance A from each other in the direction of motion B of...

second embodiment

[0051]In FIG. 5, an electrical linear motor 10 is illustrated. The reference symbols which are used in the previous figures designate parts or components with the same or comparable function or method of working, and are therefore explained below only to the extent that their tangible form, function or method of working differs from what is described above.

[0052]In the case of this embodiment, the rotor 16 has a stack 14 of multiple permanently magnetic rods 30, which arranged one above another and of essentially cuboidal shape. The stator 18 is in the form of a soft magnetic sheet metal packet stack. The stator 18 has multiple tooth pairs 22a . . . 22f with mutually opposite teeth 22. Between the teeth 22 of a tooth pair, the stack 14 is received, forming an air gap 24 and 24′ respectively.

[0053]On one side of the stack 14 of the rotor 16 (on the right-hand side in FIG. 5), the stator 18 has two magnetically conducting inner areas 50, 50a, which in the direction of motion B of the ...

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PUM

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Abstract

A linear actuator is provided with a rotor and a stator. The rotor comprises at least two stacks of permanently magnetic rods one over another, the stacks being arranged at a predetermined distance from each other. The stator is at least partly produced from a soft magnetic material, and comprises at least two pairs of teeth with teeth opposite each other, each pair of teeth receiving one of the two stacks between them while forming an air gap. The stator has at least two magnetically conducting inner areas which are located between the two stacks and arranged at a predetermined distance from each other in the direction of motion of the rotor. The inner areas are each at least partially surrounded by a substantially hollow cylindrical coil arrangement, the central longitudinal axis of which is oriented substantially transversely to the direction of motion of the rotor.

Description

BACKGROUND OF THE INVENTION[0001]This invention concerns a linear actuator, which is to be operated electrically, with a rotor and a stator, the rotor being set up to act on an element which is to be moved.PRIOR ART[0002]From JP-A-3-92518, a drive device is known, the stator in said drive device being constructed of two approximately semi-cylindrical shells, which both in the circumferential direction and in the longitudinal direction of each shell have divided teeth which face the rotor. The individual teeth of each shell are each surrounded by a coil, the central longitudinal axis of which runs in the radial direction. The result is a magnetic flux which is oriented in the radial direction, and which, starting from each one of the multiple teeth, flows into the rotor through the air gap between stator and rotor.[0003]A version, which agrees to this extent, of the stator, stator coils and rotor of a drive device for a valve arrangement in internal combustion engines is described in...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02K33/18F01L9/20
CPCF01L9/04F01L2009/0405F01L2101/00H02K41/031H02K1/146H02K1/276F01L2301/00F01L2009/2105F01L9/20
Inventor GRUNDL, ANDREASHOFFMANN, BERNHARD
Owner COMPACT DYNAMICS
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